Sealed prefocused mount for plastic par lamp

Abstract

Improved positioning means are provided to locate a light source at the focus of a parabolic aluminized reflector (PAR) lamp and, in particular to improved positioning means which center said light source in the plastic reflector of a PAR lamp and preferably an all plastic PAR lamp. The preferred mount construction being employed utilizes a plastic block having mating parts which define a cavity from which lead wires extend and which is filled with an elastomeric polymer providing both a leak-proof seal around the lead wires as well as a more reliable barrier to moisture leakage through the mount assembly. The improved positioning means can be rib elements located in the receptacle means on said reflector to which said plastic mount is joined.

What we claim as new and desire to secure by Letters Patent of the United States is: 
     
       1. An automotive headlamp having a lens directly sealed to a plastic reflector member to provide a leak-proof seal using a prefocused light source mount in the form of a sealed plastic block having at least two lead wires extending therefrom, a tungsten halogen lamp joined to the ends of said lead wires, and raised receptacle walls on said reflector member extending rearwardly from the reflector member to which the plastic block is directly sealed to form a final mount assembly which positions the tungsten halogen lamp at the focus of the reflecting surface of said reflector member, the improvement wherein said final mount assembly includes locating elements disposed in said raised receptacle walls to center for the plastic block in the center of the receptacle cavity for engagement during a subsequent bonding operation, said locating elements being joined to wall portions of said plastic block by said bonding operation, thus engaging said block to said reflector member. 
     
     
       2. A reflector lamp as in claim 1 wherein said receptacle means further includes a central opening through which said light source extends for positioning at the focus of the reflecting surface of said reflector, said central opening in said receptacle means having a raised wall portion extending rearwardly from the reflector member. 
     
     
       3. A reflector lamp as in claim 2 wherein an underside surface of the plastic block facing the reflector member is joined to the raised wall portion of the central opening in the receptacle.